<template>
  <view>
    <my-search bgcolor="#c00000" radius="15" @click.native="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->
      <scroll-view class="left-scroll-view" scroll-y :style="{ height: wh + 'px' }">
        <view class="left-scroll-view-item" :class="{ active: active === index }" v-for="(item, index) in cateList" :key="index" @click="activeChanged(index)">
          {{ item.cat_name }}
        </view>
      </scroll-view>

      <!-- 右侧的滚动视图区域 -->
      <scroll-view class="right-scroll-view" scroll-y :style="{ height: wh + 'px' }" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cate2List" :key="i2">
          <view class="cate-lv2-title">/ {{ item2.cat_name }} /</view>
          <view class="cate-lv3-list">
            <!-- 三级分类 Item 项 -->
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3.cat_id)">
              <!-- 图片 -->
              <image :src="item3.cat_icon" class="image3"></image>
              <!-- 文本 -->
              <text>{{ item3.cat_name }}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
import badgeMix from '@/mixins/tabbar-badge.js';
export default {
  name: '',
  mixins: [badgeMix],
  components: {},
  data() {
    return {
      wh: 0,
      active: 0,
      scrollTop: 0,
      cateList: [],
      cate2List: []
    };
  },
  created() {},
  mounted() {},
  onLoad() {
    let { windowHeight } = uni.getSystemInfoSync();
    this.wh = windowHeight - 50;
    this.getCateList();
  },
  methods: {
    async getCateList() {
      // 发起请求
      const { data: res } = await uni.$http.get('/api/public/v1/categories');
      // 判断是否获取失败
      if (res.meta.status !== 200) return uni.$showMsg();
      // 转存数据
      this.cateList = res.message;
      this.cate2List = this.cateList[0].children;
    },
    activeChanged(index) {
      this.active = index;
      this.cate2List = this.cateList[index].children;
      this.scrollTop = this.scrollTop === 0 ? 1 : 0;
    },
    gotoGoodsList(id) {
      uni.navigateTo({
        url: '/subpkg/goods_list/goods_list?cid=' + id
      });
    },
    gotoSearch() {
      uni.navigateTo({
        url: '/subpkg/search/search'
      });
    }
  }
};
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;

  .left-scroll-view {
    width: 120px;

    .left-scroll-view-item {
      line-height: 60px;
      background-color: #f7f7f7;
      text-align: center;
      font-size: 12px;
      // 激活项的样式
      &.active {
        background-color: #ffffff;
        position: relative;

        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item {
      width: 33.33%;
      margin-bottom: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      image {
        width: 60px;
        height: 60px;
      }
      text {
        font-size: 12px;
      }
    }
  }
}
</style>
